On Tue, May 23, 2023 at 11:54:30PM -0400, Bruce Momjian wrote: > On Wed, May 24, 2023 at 08:37:45AM +1200, David Rowley wrote: > > On Mon, 22 May 2023 at 07:05, Jonathan S. Katz <jk...@postgresql.org> wrote: > > > * Parallel execution of queries that use `FULL` and `OUTER` joins > > > > I think this should be `RIGHT` joins rather than `OUTER` joins. > > > > LEFT joins have been parallelizable I think for a long time now. > > Well, since we can swap left/right easily, why would we not have just > have swappted the tables and done the join in the past? I think there > are two things missing in my description. > > First, I need to mention parallel _hash_ join. Second, I think this > item is saying that the _inner_ side of a parallel hash join can be an > OUTER or FULL join. How about? > > Allow hash joins to be parallelized where the inner side is > processed as an OUTER or FULL join (Melanie Plageman, Thomas Munro) > > In this case, the inner side is the hashed side.
I went with this text: Allow parallelization of FULL and internal right OUTER hash joins (Melanie Plageman, Thomas Munro) -- Bruce Momjian <br...@momjian.us> https://momjian.us EDB https://enterprisedb.com Only you can decide what is important to you.